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Tech

Producing Energy From Human Knee!

by Noor ul Ain September 13, 2019
written by Noor ul Ain September 13, 2019 98 views
Producing Energy From Human Knee!
Spread the Word

Imagine powering your devices by walking. With technology recently developed by a group of researchers at the Chinese University of Hong Kong that possibility might not be far out of reach.

The group describes the technology in Applied Physics Letters. An energy harvester is attached to the wearer’s knee and can generate 1.6 microwatts of power while the wearer walks without any increase in effort. The energy is enough to power small electronics like health monitoring equipment and GPS devices.

Self-powered GPS devices will attract the attention of climbers and mountaineers.

The researchers used a special smart macrofiber material, which generates energy from any sort of bending it experiences, to create a slider-crank mechanism, similar to what drives a motor. The authors chose to attach the device to the knee due to the knee joint’s large range of motion, compared to most other human joints.

Notably, these harvesters can harvest energy directly from large deformations.

Due to the continuous back-and-forth the material will encounter when the wearer walks, every time the knee flexes, the device bends and generates electricity. This means the harvester can “capture biomechanical energy through the natural motion of the human knee.

However, previous wearable energy harvesters took advantage of the vibration caused in the device as a result of motion, which comes with drawbacks regarding efficiency.

The prototype weighs only 307 grams (0.68 pounds) and was tested on human subjects walking at speeds from 2 to 6.5 kilometers per hour (about 1 to 4 miles per hour). The researchers compared the wearers’ breathing patterns with and without the device and determined that the energy required to walk was unchanged, meaning that the device is generating power at no cost to the human.

Self-powered Equipment

The researchers note the advantages of an efficient, wearable energy harvester and look towards future commercialization of the technology.

In brief, Self-powered equipment can enable users to get rid of the inconvenient daily charge. This energy harvester would promote the development of self-powered wearable devices.

EnergyHuman KneePowertechnology
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